I have seen possibilities which have enforced a humbleness that is not good for my happiness nor conducive to my development. Henceforward I will espouse the cause of vanity. It is only the vain who deprecate vanity in others.
God is never so turned away from man, and never so much sendeth him new paths, as when he maketh ascent to divine speculations or works in a confused or disordered manner, and as it adds, with unhallowed lips, or unwashed feet. For of those who are thus negligent, the progress is imperfect, the impulses are vain, and the paths are dark.
Zoroaster, quoted at The Herb Dangerous, Part II: The Psychology of Hashish by Oliver Haddo (Aleister Crowley)
… a vain and illusory knowledge, which indeed comes from nothing and leads to nothing.
“THE unutterable void of Hell is stirred
By gusts of sad wind moaning; the inane
Quivers with melancholy sounds unheard,
Unpastured woes, and unimagined pain,
And kisses flung in vain.” [via]